Question

Find the cost of painting a tank of dimension 3 m x 2 m x 1.5 m at * 20 per square metre.
Find the total surface area of a cuboid whose length, breadth, and height are 9 cm, 7 cm, and 4 cm
respectively.
Find the surface area of a cubical box whose one side is 80 cm.​

Answer 1

${\huge{\boxed{\bf{\gray{★ANSWER»}}}}}$

Q1.

TSA= 2(lb+bh+lh)

l = 3m , b= 2m , h = 1.5m

so,

=2(2×3+2×1.5+3×1.5)

=2×13.5

= 27m

Cost :- area×cost

= 27×25 = rs. 540

Q2.

TSA= 2(lb+bh+lh)

L =9cm

B=7cm

H=4cm

so,

=2(9×7+7×4+9×4)

=2(56+28+32)

=2(116)

=232 cm²

Q3.

surface area of cube = 6a²

a=80 cm

=6(80)²

=6(6400)

=38400 cm²

HOPE IT HELPS

MARK BRAINLIEST PLS